Electronic wizard games are becoming increasingly popular, with some hitting $1bn in sales in 2017, according to a study released on Thursday.
The study by Applesee, a data analytics firm, found the sales of electronic wizard games hit a record high in 2017.
The study was based on data from Appleseek, a company that aggregates data on app-based games.
The report said in the last quarter of 2018, there were more than 5.7 million app-only wizard games available for download, up from 4.5 million in 2017 and 3.7 billion in 2014.
The figures represent just 0.1% of all apps on the market, the report said.
The figures reflect a rise in popularity among millennials, the group that made up the majority of users of the games.
Appleseeks data shows the number of app-specific wizard games on sale grew from 1.4 million in 2015 to 2.6 million in 2016 and 3 million in 2018.
Appelleses data also shows that there were 2.9 million digital wizard games sold in 2017 across mobile, desktop and console platforms, an increase of nearly 3 million from 2016.
In total, there are currently over 20,000 app-exclusive wizard games that are sold for over $1 billion in the US, according the Applesecks data.